Abstract: To further enhance the evaluation accuracy of a delayed fracture. Focusing on the fact that a calculated stress value serving as the reference for the occurrence of the delayed fracture changes depending on analysis conditions of a forming analysis, a value obtained by changing a stress value serving as the reference for the occurrence of the delayed fracture according to the analysis conditions for analyzing an intended formed article (article for practical use) is used as the reference for evaluating the delayed fracture. For example, analysis conditions of a forming analysis in an evaluation test of the delayed fracture are matched with analysis conditions of a forming analysis of an article for practical use represented by an actual automobile component.

Abstract: A urethane adhesive composition contains a urethane prepolymer (A) having an isocyanate group at its terminal, and a compound (B) represented by Formula (1), where R represents a hydrogen atom or an alkyl group, and n represents an integer of 6 or more.

Abstract: A method for manufacturing a formed component includes: determining a stress margin with a strain amount as a variable based on results of a test including placing a metal sheet in a predetermined hydrogen entry environment in a state where a load stress is loaded to a sheared surface of the metal sheet and the metal sheet is restrained; performing forming analysis of forming the metal sheet into the formed component and determining a residual stress and the amount of strain in a sheared end surface of the formed component; determining a load stress to be loaded to the sheared end surface by assembling the formed component to another component; and assessing a margin of the delayed fracture in the formed component based on the stress margin corresponding to the determined amount of strain and a total stress of the determined residual stress and the determined load stress.

Abstract: A method for assessing the delayed fracture characteristics of a sheared end surface of a metal sheet includes: a test including restraining a metal sheet where a predetermined load stress is loaded to a sheared surface of the metal sheet and placing the metal sheet for a predetermined time in a predetermined hydrogen entry environment in the restrained state; and determining a limit load stress being a load stress at the limit where a delayed fracture in the sheared surface of the metal sheet does not occur based on the results of the test and setting a stress margin to the occurrence of the delayed fracture in the sheared end surface of the metal sheet based on the determined limit load stress, in which the determined stress margin is set as an index of the assessment of the delayed fracture characteristics of the sheared end surface of the metal sheet.

Abstract: An embodiment of the present technology is an isocyanate-based adhesive used for a surface-treated crystalline thermoplastic resin base material, the isocyanate-based adhesive having a value represented by (JIS-A hardness)/(strength at break [MPa])×(elongation at break (%))/100 of 2.0 to 70 after being cured by being allowed to stand still under a condition at 23° C. and 50% RH for 3 days, and the crystalline thermoplastic resin base material having a value represented by (?d/?p+?p) of 2.0 to 30.0. ?p=?p??p0 and ?d=|?d??d0|, ?p0 is a polar term of surface free energy before the surface treatment, ?p is a polar term of surface free energy after the surface treatment, ?d0 is a dispersion term of the surface free energy before the surface treatment, and ?d is a dispersion term of the surface free energy after the surface treatment.

Abstract: A method that improves stretch flange formability of a steel sheet by individual treatment matching a material of the steel sheet without performing heat treatment in a die. This method is a method for manufacturing a steel sheet for cold press, and the steel sheet is manufactured by heating an edge of the steel sheet to a temperature within a heating temperature range preset according to a microstructure of the steel sheet and cooling the steel sheet. A region, within an edge of the steel sheet subjected to shearing in a shearing step, where it is estimated that a stretch flange crack is likely to occur when a press component is formed by cold pressing is determined, and a site to be heated and cooled is set within the region. By press-forming the manufactured steel sheet, a target press component is manufactured.

Abstract: A two-pack urethane-based adhesive that includes a second-pack liquid in which liquid components are inhibited from bleeding out and which can be inhibited from decreasing in thixotropic properties, and that gives cured products having, after aging, excellent adhesiveness. The two-pack urethane-based adhesive including a first-pack liquid, which includes a urethane prepolymer having an isocyanate group, and a second-pack liquid, which includes water, an active hydrogen compound (which is not water) having an active hydrogen capable of reacting with the isocyanate group, and cellulose nanofibers, wherein the first-pack liquid and the second-pack liquid each independently contain carbon black and/or an inorganic-based filler, the content of the cellulose nanofibers being 0.1-1.5 mass % with respect to the content of the water.

Abstract: A method for improving the delayed fracture characteristics of a metal sheet made of a high-strength steel sheet to suppress delayed fracture from a sheared end face after forming by a simple method. A method for improving delayed fracture characteristics of a metal sheet, the metal sheet having a sheared end face on at least a part of a sheet end portion and being made of a high-strength steel sheet. Plastic deformation is imparted to at least a part of the sheared end face of the metal sheet.

Abstract: The layered structure of the present invention is a layered structure formed by directly layering a resin cured layer (ii) containing a curable resin (E) having a urethane bond, on a molded body (i) composed of a polypropylene-based resin composition, wherein the polypropylene-based resin composition contains 5 to 47 parts by mass of a propylene-based polymer (A) having an MFR of 50 to 150 g/10 min, and an amount of a decane-soluble portion of 6 to 15% by mass, 20 to 30 parts by mass of a propylene homopolymer (B) having an MFR of 10 to 500 g/10 min, 23 to 30 parts by mass of an ethylene/?-olefin copolymer (C) being a random copolymer of ethylene and an ?-olefin having 4 to 8 carbon atoms, and having a density of 0.850 to 0.880 g/cm3, an MFR of 0.5 to 30 g/10 min, and a melting point peak of 110° C. or more, and 30 to 40 parts by mass of an inorganic filler (D).

Abstract: There is provided a two-part urethane adhesive composition including: a main agent containing a polyisocyanate component (A); and a curing agent containing water and an active hydrogen-containing compound (B). The (B) contains a compound represented by Formula (4); the (A) contains a urethane prepolymer (A-3); an average active hydrogen concentration of the (B) is 0.50 to 3.50 mol/kg; an average active hydrogen concentration of the (B) and the water is 2.00 to 8.00 mol/kg. The main agent and the curing agent are mixed in such amounts as to satisfy conditions that: a ratio of the number of isocyanate groups of the (A) to the number of active hydrogens of the (B) is 1 to 5; and a ratio of the number of isocyanate groups of the (A) to the total number of active hydrogens of the (B) and the water is 0.5 to 2.5.

Abstract: A two-part urethane adhesive composition that provides excellent initial adhesiveness and excellent long-term adhesiveness. An embodiment of the present invention is a two-part urethane adhesive composition including a main agent containing a urethane prepolymer having an isocyanate group, and a curing agent containing a compound (A) having two or more active hydrogen-containing groups per molecule, the compound (A) including a polyol compound (a1), the polyol compound (a1) having three active hydrogen-containing groups per molecule, having ethylene oxide at a terminal, having a number average molecular weight of greater than 1000 and 20000 or less, having a degree of unsaturation of 0.01 meq/g or less, and having molecular weight distribution (Mw/Mn) of 1.05 or less, and a molar ratio of a total amount of active hydrogen in the compound (A) with respect to an amount of the isocyanate group being 0.2 or greater and less than 0.8.

Abstract: A 2-component type urethane-based adhesive composition that exhibits excellent workability, excellent mechanical discharge properties and excellent heat-resistant adhesive properties. This 2-component type urethane-based adhesive composition contains: a main agent, which contains a urethane prepolymer (A) having an isocyanate group at a terminal, a compound (B) having an isocyanurate ring, and a silane coupling agent (C); and a curing agent, which contains a compound having two or more active hydrogen-containing groups per molecule. The main agent or the curing agent also contains a hollow body (E) having a pressure resistance strength of 10 MPa or more.

Abstract: A two-pack urethane-based adhesive that includes a second-pack liquid in which liquid components are inhibited from bleeding out and which can be inhibited from decreasing in thixotropic properties, and that gives cured products having, after aging, excellent adhesiveness. The two-pack urethane-based adhesive including a first-pack liquid, which includes a urethane prepolymer having an isocyanate group, and a second-pack liquid, which includes water, an active hydrogen compound (which is not water) having an active hydrogen capable of reacting with the isocyanate group, and cellulose nanofibers, wherein the first-pack liquid and the second-pack liquid each independently contain carbon black and/or an inorganic-based filler, the content of the cellulose nanofibers being 0.1-1.5 mass % with respect to the content of the water.

Abstract: To further enhance the evaluation accuracy of a delayed fracture. Focusing on the fact that a calculated stress value serving as the reference for the occurrence of the delayed fracture changes depending on analysis conditions of a forming analysis, a value obtained by changing a stress value serving as the reference for the occurrence of the delayed fracture according to the analysis conditions for analyzing an intended formed article (article for practical use) is used as the reference for evaluating the delayed fracture. For example, analysis conditions of a forming analysis in an evaluation test of the delayed fracture are matched with analysis conditions of a forming analysis of an article for practical use represented by an actual automobile component.

Abstract: A urethane adhesive composition contains a urethane prepolymer (A) having an isocyanate group at its terminal, and a compound (B) represented by Formula (1), where R represents a hydrogen atom or an alkyl group, and n represents an integer of 6 or more.

Abstract: A shearing work technology of metal sheets, such as high-strength steel sheets, is excellent in stretch flange crack resistance and delayed fracture resistance of the sheared end surface. A metal sheet shearing work method including: applying double shearing work to an end portion of at least one part of the metal sheet; and forming a first area having a cutting margin of a second shearing work of 5 mm or less in first cutting in the double shearing work. Second cutting in the double shearing work is carried out in a state where the movement on an end portion side of the first area is restrained. For example, by providing projection areas continuous to the first area and restraining the projection areas, the movement on the end portion side of the first area is restrained.

Abstract: There is provided a two-part urethane adhesive composition including: a main agent containing a polyisocyanate component (A); and a curing agent containing water and an active hydrogen-containing compound (B). The (B) contains a compound represented by Formula (4); the (A) contains a urethane prepolymer (A-3); an average active hydrogen concentration of the (B) is 0.50 to 3.50 mol/kg; an average active hydrogen concentration of the (B) and the water is 2.00 to 8.00 mol/kg. The main agent and the curing agent are mixed in such amounts as to satisfy conditions that: a ratio of the number of isocyanate groups of the (A) to the number of active hydrogens of the (B) is 1 to 5; and a ratio of the number of isocyanate groups of the (A) to the total number of active hydrogens of the (B) and the water is 0.5 to 2.5.

Abstract: An object of the present invention is to provide a urethane adhesive composition having excellent initial adhesiveness and excellent adhesion durability. The present invention is a urethane adhesive composition containing a urethane prepolymer (A) having an isocyanate group, an isocyanate compound (B) having an isocyanurate structure and an isocyanate group, and an adduct of a compound represented by Formula (X) below (in Formula (X), R11 and R12 each independently represent a hydrocarbon group) and a phenol compound.

Abstract: The present technology provides a bonded article, comprising: a first member containing plastic and including a portion that has been flame-treated under a condition A1 shown below; a second member; and an adhesive that bonds the first member and the second member to each other, wherein the first member adheres with the adhesive at the flame-treated portion, and a primer is not interposed between the first member and the adhesive: (Condition A1) a volume ratio RA1 of air and combustion gas used for generation of flame in the flame treatment, and a volume ratio RP of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (1): 0.8?volume ratio RA1/volume ratio RP?1??(1).

Abstract: The present invention is to provide a urethane adhesive composition which exhibits excellent heat-resistant adhesion after storage to resin. The present invention relates to a urethane adhesive composition including: a urethane prepolymer having an isocyanate group; an isocyanurate compound having an isocyanurate ring; a terpene compound having active hydrogen; and a vinyl silane coupling agent represented by Formula (A) below: (where in Formula (A), R1 and R3 each independently represent a monovalent hydrocarbon group, R2 represents a (n+1) valent hydrocarbon group, Vi represents —CH?CH2, m1 is from 1 to 3, m2 is from 1 to 3, m3 is from 0 to 2, m1+m2+m3 is 4, and n is 1 or greater).